Entanglement-Driven Spacetime Dynamics: Gravity and Dark Energy as Information-Theoretic Phenomena

We propose that both gravitational time dilation and cosmic acceleration arise from a single information-theoretic mechanism: quantum decoherence constrained by holographic entropy bounds. Using the Wheeler--DeWitt equation and the Page--Wootters mechanism, we identify time with the local decoherence rate. Near massive objects the Bekenstein bound is approached, bandwidth saturates and decoherence slows--producing gravitational time dilation consistent with Gravity Probe~A. At cosmic scales the accumulation of entanglement entropy forces the holographic boundary to expand, driving late-time acceleration without new fields.Entanglement configurations acquire a Finsler metric structure whose Ricci-curvature instabilities yield a depopulation sequence (3-1 →2-2 →1-3 →0-4) confirmed by the observed coupling-constant hierarchy. The framework predicts an evolving dark-energy equation of state w(z) correlated with cosmic star-formation history and makes falsifiable predictions for w(z), H(z) and CMB anisotropy patterns testable by CMB-S4 and DESI. It also provides a natural interface with Penrose's Conformal Cyclic Cosmology.